CVE-2025-38529 Information

Aug 17, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

comedi: aio_iiro_16: Fix bit shift out of bounds

When checking for a supported IRQ number the following test is used:

if ((1 << it->options[1]) & 0xdcfc)

However it->options[i] is an unchecked int value from userspace so the shift amount could be negative or out of bounds. Fix the test by requiring it->options[1] to be within bounds before proceeding with the original test. Valid it->options[1] values that select the IRQ will be in the range [115]. The value 0 explicitly disables the use of interrupts.

Reference

https://git.kernel.org/stable/c/43ddd82e6a91913cea1c078e782afd8de60c3a53 https://git.kernel.org/stable/c/66acb1586737a22dd7b78abc63213b1bcaa100e4 https://git.kernel.org/stable/c/955e8835855fed8e87f7d8c8075564a1746c1b4c https://git.kernel.org/stable/c/e0f3c0867d7d231c70984f05c97752caacd0daba https://git.kernel.org/stable/c/ff30dd3f15f443d2a0085b12ec2cc95d44f35fa7

CNNVD-202508-1948 (Published: 2025-08-16)

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